_dta:
  1.  by Jean Roth , jroth@nber.org , 11 Mar 2015

  obs:     4,106,223                          
 vars:             3                          11 Mar 2015 18:15
 size:   139,611,582                          (_dta has notes)
-------------------------------------------------------------------------------
              storage   display    value
variable name   type    format     label      variable label
-------------------------------------------------------------------------------
npi             str10   %10s                  National Provider Identifier
                                                (NPI)
seq             float   %9.0g                 # of Provider License Number in
                                                NPPES file
plicnum         str20   %20s                  Provider License Number
-------------------------------------------------------------------------------
Sorted by:  npi  seq